<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>基础的get请求</title>
</head>

<body>
  <h1>基础的get请求</h1>
  <form id="form" action="" method="">
    <input id="ipt" type="text">
    <button id="btn">输入学生id 查询他的详细信息</button>
  </form>

  <script>
    const oBtn = document.getElementById('btn');
    const oIpt = document.getElementById('ipt');
    const oForm = document.getElementById('form');
    oForm.onsubmit = function(){
      const userInfo = oIpt.value
      const xhr = new XMLHttpRequest()
      xhr.open('get',`/userInfo/${userInfo}?_=${Date.now()}`)
      xhr.send()
      xhr.onreadystatechange = function(){
        if(xhr.readyState === 4 && xhr.status >= 200 && xhr.status <= 299){
          console.log(JSON.parse(xhr.responseText));
        }
      }
      return false
    }
    // oForm.onsubmit = function(){
    //   const userInfo = oIpt.value
    //   const xhr = new XMLHttpRequest()
    //   xhr.open('get',`/userInfo/${userInfo}?_=${Date.now()}`,true)
    //   xhr.send()
    //   xhr.onreadystatechange = function(){
    //     if(xhr.readyState === 4 && xhr.status >= 200 && xhr.status <= 299){
    //       console.log(xhr.responseText);
    //       const sj = JSON.parse(xhr.responseText)
    //       console.log(sj);
    //     }
    //   }
    //   return false
    // }


    // oForm.onsubmit = function () {
    //   //先获取用户输入的userId
    //   const userId = oIpt.value;

    //   const xhr = new XMLHttpRequest();


    //   /* 
    //     1.path传参:就是把参数以路径的形式写入
    //   */
    //   xhr.open("GET", `/userInfo/${userId}?_=${Date.now()}`, true)
    //   xhr.send();

    //   xhr.onreadystatechange = function () {
    //     if (xhr.readyState === 4 && (xhr.status >= 200 && xhr.status <= 299)) {

    //       // console.log(xhr.responseText);
    //       const data = JSON.parse(xhr.responseText)
    //       console.log(data);
    //     }
    //   }

    //   return false;
    // }
  </script>
</body>

</html>